Semiconductor integrated circuit

Abstract

A semiconductor integrated circuit includes a bridge circuit which controls a data transfer of a bus line, peripheral circuits which are connected to the bridge circuit through the busline, and a control circuit which is formed at the peripheral circuits. The control circuit receives a select signal and controls the data transfer in the peripheral circuits in accordance with a logic state of the select signal.

1. A semiconductor integrated circuit, comprising:
 a bridge circuit which controls a bus line, wherein the bus line includes a main bus line connected to the bridge circuit, a first branch bus line connected to the main bus line, and a second branch bus line which is longer than the first branch bus line; 
 a control circuit, connected between the first and second branch bus lines, which receives a select signal and transfers a data from the first branch bus line to the second branch bus line in accordance with a logic state of the select signal; and 
 a peripheral circuit which is connected to the second branch bus line, 
 wherein the main bus line, the first branch bus line and the second branch bus line are address bus lines, and the data transferred is an address of the peripheral circuit. 
 
   
   
     2. The semiconductor integrated circuit according to  claim 1 , wherein the control circuit includes an AND circuit. 
   
   
     3. The semiconductor integrated circuit according to  claim 1 , wherein the control circuit includes a latch circuit. 
   
   
     4. A semiconductor integrated circuit comprising:
 a bridge circuit which controls a data transfer of a bus line, 
 the bus line including a main bus line connected to the bridge circuit and a plurality of first branch bus lines respectively connected to the main bus line; 
 a plurality of control circuits, connected to respective different ones of the first branch bus lines, 
 the bus line further including a plurality of second branch bus lines which are respectively connected to the first branch bus lines by the control circuits, the second branch bus lines are longer than the first branch bus lines; and 
 peripheral circuits respectively connected directly to the second branch bus lines only, 
 the control circuits receiving respective select signals and selectively disconnecting the bridge circuit from the peripheral circuits by disabling transfer of data between the first branch bus lines and the second branch bus lines in accordance with logic states of the select signals. 
 
   
   
     5. The semiconductor integrated circuit according to  claim 4 , wherein the control circuits include AND gates. 
   
   
     6. The semiconductor integrated circuit according to  claim 4 , wherein the control circuits include latch circuits. 
   
   
     7. The semiconductor integrated circuit according to  claim 4 , wherein the main bus line, the first branch bus lines and the second branch bus lines are address bus lines, and the data transferred are addresses of the peripheral circuits. 
   
   
     8. A semiconductor integrated circuit comprising:
 a bridge circuit which controls a data transfer of a bus line, 
 the bus line including a main bus line connected to the bridge circuit and a plurality of first branch bus lines respectively connected to the main bus line; 
 a plurality of control circuits, connected to respective different ones of the first branch bus lines, 
 the bus line further including a plurality of second branch bus lines which are respectively connected to the first branch bus lines by the control circuits, the second branch bus lines are longer than the first branch bus lines; and 
 peripheral circuits respectively connected directly to the second branch bus lines, 
 
     wherein the peripheral circuits are not connected directly to the main bus line,
 the control circuits receiving respective select signals and selectively disconnecting the main bus line from the peripheral circuits by disabling transfer of data between the first branch bus lines and the second branch bus lines in accordance with logic states of the select signals. 
 
   
   
     9. The semiconductor integrated circuit according to  claim 8 , wherein the control circuits include AND gates. 
   
   
     10. The semiconductor integrated circuit according to  claim 8 , wherein the control circuits include latch circuits. 
   
   
     11. The semiconductor integrated circuit according to  claim 8 , wherein the main bus line, the first branch bus lines and the second branch bus lines are address bus lines, and the data transferred are addresses of the peripheral circuits.